I smoke 5 cigarettes a day. Does it really matter?

Yes. Any tobacco use raises thrombotic risk on the combined pill, even moderate. The risk is dose-dependent: the more you smoke, the higher it climbs. But even 5/day isn't neutral.

At 30, I've smoked and taken the pill for 10 years with no problem. Should I switch?

No emergency if you have no other risk factor (hypertension, diabetes, history). But discuss with your GP/gynaecologist — many recommend moving to a progestogen-only pill or IUD rather than waiting for 35.

If I switch to vaping, can I keep the combined pill after 35?

Vaping still contains nicotine, which remains vasoconstrictive. Risk is probably lower than smoked tobacco (no CO, no tars), but data are still limited. Guidance stays cautious. Better to change pill or fully come off nicotine.

I had a DVT 5 years ago. Which contraception now?

Combined pill ruled out for life. Prefer: progestogen-only pill, copper IUD, hormonal IUD, or implant. Discuss with your doctor.

What are the first signs of a DVT?

Calf or thigh pain, asymmetric swelling (one leg bigger than the other), local redness or warmth, pain on walking. Any unusual sign in a woman who smokes and takes the pill warrants prompt review.

If I quit smoking, does the risk go back to a non-smoker's?

Almost, yes. Smoking-related thrombotic risk drops quickly after quitting and comes close to a non-smoker's within a few months. You'll then be free to consider any contraception without a smoking contraindication.

Is vaping compatible with the pill?

Better than smoking, but not benign. Nicotine remains vasoconstrictive. If you vape as a transition off cigarettes, that's progress — NHS supports this in the UK. Long-term, aim for zero nicotine.

Smoking, the combined pill and thrombosis: why this mix is high-risk, especially after 35

The combined oestrogen-progestogen pill plus smoking multiplies the risk of DVT, pulmonary embolism, stroke. WHO and NICE advise against it after 35.

June 11, 2026 Aria

The scientific basis on quitting smoking was reviewed on a voluntary basis by Pr. Bertrand Dautzenberg , a tobacco specialist, in order to rule out gross, potentially dangerous errors. It reflects positions commonly shared by health professionals and health agencies, without always corresponding exactly to his thinking or his practice. He is not the author of this text; he has only carried out a vigilance review of it.

It's one of the most underestimated risks in women's health: combining the combined (oestrogen-progestogen) pill and smoking significantly multiplies the risk of DVT, pulmonary embolism, heart attack and ischaemic stroke. Especially after 35. WHO and NICE guidelines are clear — you just have to know them.

The high-risk cocktail

× 10 risk of deep vein thrombosis in a woman under 35 smoking more than 15 cigarettes/day and taking the combined pill — compared to a non-smoker without hormonal contraception.

Compiled studies on smoking, contraception and thrombosis

What the actual risks are

Venous thromboses

Arterial thromboses

Official guidance

The risk of thrombosis increases with age and smoking. In women over 35 smoking up to 15 cigarettes a day, combined hormonal methods are generally not recommended; in women smoking more, they are contraindicated.

WHO Medical Eligibility Criteria for Contraceptive Use; NICE CKS

Profile	Combined pill
Woman < 35, non-smoker	Possible, no major risk
Woman < 35, moderate smoker	To discuss — raised risk
Woman < 35, > 15 cig/day	Avoid, choose alternatives
Woman ≥ 35, non-smoker	Possible with monitoring
Woman ≥ 35, smoker	Not recommended by WHO/NICE
Personal DVT history	Contraindicated
Family thrombosis history	To discuss, work-up advised
Migraine with aura	Contraindicated

Which pill = which risk?

Alternatives if you smoke

What to do if this is you

Assess your risk

age, cigarettes per day, personal and family history.
Book a GP/gynaecologist appointment soon if you're on the combined pill and smoke after 35.
Discuss alternative contraceptives.
Plan quitting

the ideal option, allowing every type of contraception.
If switching pills, the thrombotic risk is temporarily higher in the first year and on generation changes.

The benefit of quitting

Days after quitting blood viscosity drops.
2 to 4 weeks clear improvement in endothelial function.
3 to 6 months thrombotic risk almost back to a non-smoker's.
The pill's thrombotic risk itself falls within a few months of stopping the pill.

In United Kingdom

Your questions

I smoke 5 cigarettes a day. Does it really matter?

Yes. Any tobacco use raises thrombotic risk on the combined pill, even moderate. The risk is dose-dependent: the more you smoke, the higher it climbs. But even 5/day isn't neutral.
At 30, I've smoked and taken the pill for 10 years with no problem. Should I switch?

No emergency if you have no other risk factor (hypertension, diabetes, history). But discuss with your GP/gynaecologist — many recommend moving to a progestogen-only pill or IUD rather than waiting for 35.
If I switch to vaping, can I keep the combined pill after 35?

Vaping still contains nicotine, which remains vasoconstrictive. Risk is probably lower than smoked tobacco (no CO, no tars), but data are still limited. Guidance stays cautious. Better to change pill or fully come off nicotine.
I had a DVT 5 years ago. Which contraception now?

Combined pill ruled out for life. Prefer: progestogen-only pill, copper IUD, hormonal IUD, or implant. Discuss with your doctor.
What are the first signs of a DVT?

Calf or thigh pain, asymmetric swelling (one leg bigger than the other), local redness or warmth, pain on walking. Any unusual sign in a woman who smokes and takes the pill warrants prompt review.
If I quit smoking, does the risk go back to a non-smoker's?

Almost, yes. Smoking-related thrombotic risk drops quickly after quitting and comes close to a non-smoker's within a few months. You'll then be free to consider any contraception without a smoking contraindication.
Is vaping compatible with the pill?

Better than smoking, but not benign. Nicotine remains vasoconstrictive. If you vape as a transition off cigarettes, that's progress — NHS supports this in the UK. Long-term, aim for zero nicotine.

sources

WHO, Medical Eligibility Criteria for Contraceptive Use (latest edition).
NICE CKS, Contraception — combined hormonal methods.
Faculty of Sexual and Reproductive Healthcare (FSRH), CHC guideline.
MHRA, Combined hormonal contraceptives and venous thromboembolism.
Cancer Research UK / British Heart Foundation, Smoking and vascular risk in women.
Compiled studies on smoking and thromboses on oral contraception.